What is the term that indicates the stress on a word or phrase?

The correct term that indicates the stress on a word or phrase is emphasis. In the context of spoken language, emphasis refers to the way certain words are pronounced with greater force or intensity to highlight their importance or to convey a particular feeling or meaning. This can significantly alter the impact of a message, as it draws the listener’s attention to specific parts of the speech.

Intonation, while related, refers to the variation in pitch when speaking, which can also convey emotions or indicate questions, statements, or other nuances in speech but does not specifically denote stress on individual words or phrases. Volume refers to how loud or soft a voice is during speech, impacting how well one can hear the words but not the stress itself. Register pertains to the level of formality or informality in a particular language or speech context and is more about the choice of vocabulary and style rather than the stress on individual words.